Adjustable drilling jig



Dec. 26, 1950 D. KLINGMAN 2,535,581

ADJUSTABLE DRILLING JIG Filed Aug. 2, 1946 V 2 Sheets-Sheet 1 Dec'. 26, 1950 D. KLINGMAN 2,535,581

ADJUSTABLE DRILLING JIG Filed Aug. 2, 1946 2 Sheets-Sheet 2 BMM@ 4770@ /VEY Patented Dec. 26, 1.950

UNITED STATES PATENT OFFICE 2,535,581 y ADJUSTABLE DRILLING JIG David Klingman, Brooklyn, N. Y.

Application August 2, 1946, Serial N o. 687,930

(Cl. Wl- 62) claims. 1

This invention relates generally to clamping devices and more particularly to the improved drilling jig construction which is versatile and highly useful in operation.

In drilling a workpiece or performing similar operations thereon it is well-known that the accuracy of the work is increased when the drill or other tool is supported close to the workpiece in a relatively rigid manner. Where a very large number of finished pieces is required, jigs and fixtures of a permanent nature are frequently constructed. Where a smaller number of finished pieces is desired, the cost in time and material may not allow the construction of such jigs and fixtures from an economic point of view. As a result of this, the workman may resort to makeshifts which, in view of the low accuracy of the parts produced, are of little worth.

It is therefore among the principal objects of the present invention to provide a novel and useful adjustable drilling jig which may be quickly and conveniently altered in arrangement so as to accommodate various workpieces of different sizes and shapes.

Another object lies in the provision of a device of the class described which provides a support for the tool close to the workpiece.

Another object herein lies in the provision of an adjustable jig having orifices for the passage of chips and shavings.

A feature of the present invention resides in the fact that support for the drill or other tool may be arranged with respect to the workpiece a'nd with respect to the base element so that the cutting tool may freely penetrate the workpiece without having its cutting edges damaged by contact with the base element.

Another object herein lies in the provision of structure of the class described, utilizing a minimum of machined parts so that said device may be manufactured in large scale at low cost to have consequent wide distribution and use.

` A feature of the invention lies in the fact that the jig need not be lifted to discharge chips but need only be laterally slid until a portion of the central opening of the base element overhangs the table on the drill press whereby shavings and chips will be discharged into a suitable container or the floor.

These objects and other incidental ends and advantages will more fully appear in the progress.

of this disclosure and be pointed out in the appended claims.

In the drawings in which similar reference characters designate corresponding parts throughout the severaI views:

Figure 1 is a view in perspective of an embodiment of the invention.

Figure 2 is a vertical sectional View as seen generally from the plane 2--2 and Figure 1.

Figure 3 is an exploded view showing the drill guide element and drill bushing.

Figure 3A is a perspective view of an :alternate form of spacer element.

Figure 4 is a view in perspective of the main lower clamp element.

Figure 5 is a view in perspective of a rst work positioning element, or work piece clamp..

Figure 6 is a View in perspective of a second work positioning element, or work piece guide.

In accordance with the invention the adjustable drilling jig Ill comprises broadly a 'base element a drill guide element l2, a main lower clamp element I3, a first work positioning eleilnent I4, and a second work positioning element The base element includes a frame memberV I6. The frame member I6 is preferably rectangular in shape and for the purpose of facilitating the description may include front and rear portions and |8 and side portions I9 and 20. Projecting downwardly from the frame member |6, and spaced inwardly from the outer vertical surfaces of said frame member is an annular frame support member 2|. The frame member I6 has a top surface 22 which is preferably smooth and a bottom surface 23, also preferably smooth. The surfaces 22 and 23 are preferably parallel with respect to each other. Bridging between the inner vertical wall surfaces 24 and 25, and 26 and 2l are a plurality of work support members 2B, 29, 30 and 3|, and 32 and 331, respec-` tively straight. This shape and arrangement of the edges 31 and 38 permit a workpiece such as the workpiece 40 to be shifted about so that while supported adequately against drill bit pressure clearance may be had for the drill bit to extend through the workpiece.

The criss-cross arrangement of the work support members 28-33 provides a plurality of passages generally indicated by reference character 4| through which chips and shavings may readily pass under the action of gravity,

While I have shown the frame member I6 as being rectangular it may have any other suitable The upper edges general shape as, for example, round, oval or polygonal.

The frame member I6 is provided with a plurality of threaded holes 44-49 inclusive, not all of which are specifically illustrated in the drawings, particularly the threaded holes which contain the bolts U and 5I. rIhe holes last mentioned serve to position the parts, as will more fully appear, to meet particular drilling arrange ments and while I have placed 8 holes in the frame member I6, this number may be altered, depending upon the range of adjustment desired..

The drill guide element I2 is best seen in Fig,- ures l, 2 and 3, and includes a pair of legs 54 and 55 which are spaced and parallel, having theindentation 55 therebetween. The inner surfaces of the legs 54 and 55 are spaced'a distance sufficient to allow passage therebetween of the bolts 52 and 53. The front end 51 of the guide element Izhas an opening 58 adapted to receive a drill bushing 59, the internal diameter of which is. correlativa to the drill bit (not shown) which may extend through the same during the drilling operation. A set screw 55 serves to draw the two forward juxtaposed portions 6I and. 62 of the. front end 5i together to detachably clamp the drill bushing 59 in place. The under surface 63 of the element I2 is preferably placed as close to the top surface 54 of the workpiece. 4D as possible or convenient, andA for this purpose spacers 65 and Se are used. The spacers 55. and 65 are, in the shape of collars or washers whose bores are at least equal to the diameter of the bolts 52 and 53,. The spacers 65 and 55 may therefore be varied in length (vertical direction as viewed in Figure 2) to accommodate the height of the rworkpiece 40. As' a matter of convenience, a supply of spacers 6.5 and 6.6 of varying lengths in pairs. may be kept for use with the device I0. The. bolt 52 may `penetrate any of the holes 114-49, and in other arrangements, even those holes which, as placed in Figure l, are penetrated by the bolts 5B. and 5.1.

The bolt 53. threadedly engages the main lower clamping element I3. is of generally Lshape,.including a vertical portion 6'! and a horizontal' portion. The portion.

68. is adapted to be drawn up snugA against the,

surface '23 when the bolt53 is tightenedby pene` trating thethreaded hole E59. This construction provides for the rotation or" the element l2., about the bolt 52 as a, pivot. and of clamping said' elev effective clamping pressure upon the base IlL occurs against the upper and lower surfaces 22 and 23, only these surfaces are desirably smoothed as by machining. The uppermost portions ofthey upper edges of the members 28-33 inclusive are' The` preferably coplanar with the surface 22. surface 35 is preferably smooth so that the base il may have a rm footing upon the drill presstable. Since only the outer edge portion of the surface 23 is engaged by the upper surface '50 of the horizontal portion 68, only such portion need be smoothedfor desired engagement of the parts.

The first work clamping element I4 has legs H and 'I2 Iwhich are preferably substantially identical with the legs 54 and 55 so that they may be penetrated by the screw 5i) for maintaining said rIfhe clamping elementy I3 v element I4 in fixed position. The screw bolt 50 is selectively engageable with any of the remaining unoccupied threaded orices in the frame I6. The front portion 'I3 of the element Id is preferably perpendicular with respect to the rear legs thereof and has a smooth surface id. The front portion 73 is provided with a plurality of spaced orices 'i5 capable of receiving the shank of a headed pin i5. The pin i5 is, also engageable with any one of the orifices 'il in the second work positioning element I5. By adjusting the elements is or I5 and the pin 16, a guided or keyed arrangement may be made for drilling a series of equidistantly spaced holes in an elongated workpiece (not shown).

The element I 5 has a pair of legs I8 and I9 which are similar to the legs 'Il and l2, although preferably shorter. The forward portion is aligned ewith the leg TIS while the side portion 8| is at right angles to the portion 8,5. The element I5; is clamped in position by the screw 5I which may be shifted about the frame i5 in a manner similar to the screw 5@ or the screw '52, that is,

occupying any unoccupied hole.

Since the bolts 55 and 5I penetrate the indentations said members may be shifted longitudinally with respectV to saidindentations or rotated about the screwsi and 5.2i as centers. It thus isv possible to maneuver the elements le and i5, and the ele ment I 2 so as to position the workpiece 4.0. (or another workpiecewith a wide range of sizesand`v shapes within the capacity of the device IIJ)l whereby it may be drilledv or otherwise machined through4 the guide l2 at a variety of. locations.`

Where special rigidity isreouired and the legs.V

In Figure 3A a spacer element Iil is shown,;

which may be substituted for the spacers` 55 and 6G. The screw 52 passes through the hole IUI and the screw 53 through the open ended slot IEB.

It may thus be seen thatv I have: disclosedanovel; and useful drilling jig construction whichv is simple in manufacture and operation, highly;

versatile,l accurate, and low in cost.

I wish it to be understoodv that I do not desire tobev limited to the exact details of construction shown and described, for obvious modifications will occur to a person skilled in the art.

I claim:

l. An adjustable drill jig,. comprising; a tool? guideya base having: an annular frame member defining a,v relatively large opening between op posite inner surfaces of said frame membermeans.: associating` said guide with said base; a plurality of work support members extendingl between Op*` posits porti-ons of said frame member forming passages; and a frame support member lyinglbee;

low-said frame. member and having a lower edge;

said work support members having lower-edges. which are disposed above the lower edge of thee frame support member; whereby said drill may penetrate the passages between the work support;

members so thatishavings and debris produced by the drill may pass laterally beneath the` work supportmembers.

2. An adjustable drill jig, comprising; a, .bass

having an annular frame member with first and second surfaces.; a. drill guide element havingan` opening in one portion'VV thereof` adapted tofbef between the legs of the members Ill andl I5.,v

penetrated by said drill; first means slidably and pivotally connecting said drill guide element to the first surface of said frame member; and second means engaging the second surface of the frame member and said drill guide element.

3. An adjustable drill jig, comprising: a base having an annular frame member with rst and second surfaces; a drill guide element having an opening in one portion thereof adapted to be penetrated by said drill; iirst means slidably and pivotally connecting said drill guide element to the rst surface of said frame member; and second means engaging the second surface of the frame member and said drill guide element, said second means including an L-shaped clamp member.

4. An adjustable drill jig, comprising: a base having an annular frame member With rst and second surfaces, said rst and second surfaces being spaced and substantially parallel; a drill 5. An adjustable drilling jig comprising: a drill guide, a base having an annular frame member, means associating said guided with said frame member, a work positioning element having an elongated opening therein; means penetrating said opening for clamping said positioning element to said frame member; said Work positioning element including a front portion; said front portion having a plurality of holes; a pin selectively engageable with said holes; said pin predetermining a plurality of positions at which the tool guide may be secured.

DAVID KLINGMAN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 111,084 Reaney Jan. 17, 1871 1,017,846 Budlong Feb. 20, 1912 1,060,574 Anderson May 6, 1913 2,148,156 Hogapian Feb. 2.1, 1939 2,401,054 Daley May 2B, 1946 2,407,769 Anderson Sept. 17, 1946 

